Wood-screw machine



(No Model.)l

' C. E'. WARDELL.

WOOD SCREW MACHINE. No. 302,068. PatentegJuly 151884.

n. Pneus www. www nc' l UNITED STATES.

CHARLES r. wAnnnLn or CHICAGO, ILLINOIS.

woon-SCREW MACHINE.

' i SPECIFICATION vforming part of Letters Patent No. 302,068, dated July 15, 1884.

y i Application filed May fl, 1883. (No model.) v

' To all whom, it may concern.:

' the different figures.-

Be it known that I, CHARLES F. WARDELL, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented new and useful Improvementsin a VVood-Screw Machine; and 'I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawings, which forma part of the same. I

Like letters indicate the same parts in allv My invention relates to -machines for the manufacture of wood-screws; and it consists` in the novel construction of. the pointingmechanism, whereby the point of the blank is directed t'o the cutting-knife and is relieved from all liability of breaking the machine in case the point ofthe blank is bent or split; and myinvention also consists in the combination of mechanisms which hold and operate the spin dle, and which carry thecutting-tool that cuts the point of the screw.

'In the accompanying drawings, illustrating my invention, Figure I shows a side elevation of a machine containing my4 improvements; Fig. 2, an end elevation ofthe same; Fig. 3, aV sectionallview of a detached portion of the same, taken at the line .fr x, Fig. l. Fig. 4 is a cross-section on the -linefz/ y, Fig. 3. Fig. 5 is an end view of the bushing. Figs. 6 and 7 vertical central sections of the same, taken at the line 'v v,- VFig. 8, a horizontal view ofy the same; and Fig. 9 is a perspective view of the cutting-knife. K

In the laccompanying drawings, `A represents the frame of the machine, whichcarries the operating part. a

B is a shaft with suitable bearings on the' frame, and is provided with suitable means for receiving the driving-power of themachine.

C iS a double-acting cam on the* shaft B, which operates a pivoted lever, -DL This lever is pivoted to the frame of the machine at E and imparts -motion to the pin or arm F. y

G is a spring attached to the pivoted lever D at one end, which passes up on the opposite side of the arm F and operates it, as hereinafter described. f

H is a sliding sleeve, provided with the pin or arm F, and is operated by it and the Spring the knife. i

which is vibrated with the pivoted lever D,

and is caused to 'slide back and forth in the sleeve I. which is supported on the machine. J is a bar vor spindle, which passes through the sleeve H, and is held Vtherein at any de- 1 siredposition by means of the set-screwK. This bar or spindle J carries the pointing-tool for pointing the screw.

L is a socket vfirmly secured Vto the end of the spindle J.

Mis a bushing set into the socketLagainst l the end of the spindle J, as clearly shownl in Fig. 3. i

N is a knifeor cutting-tool, that isplaced in a slot in the end of the spindle 4J and in the bushing M, so that its edge will act upon the point of the screw-blank -to cut it to adesired point. This knife is held in place by the socket L, fastened around the end of the spindle J, and serves to keep the bushing M from turning in the socket. The knife is also set up, when ground, by sliding it along parallel with the spindle andbushing M. This combination of the knife with the spindle, bushing, and socket makes it necessary to make the knife `of lthe special shape shown in Fig. 9. The end of the bushing M is concave, as shown in Figs. 6 and 7, and at its center it has`a recess, O, of the size and'shape of the point of rthe screw. The cuttingedge of the knife eX- tends intothis recess O, as clearly shown in Fig. 6, so ,as to cut the end ofthe blank screw lto the desired'point as it passes into the re-M cess O. S is a slot extending into one side of the recess O, through which the chips cut from the screw-blank in pointing it pass away from l? are ordinary gripping-clamps for holding the blank screw while it is being pointed and screw-threaded.

Qrepresents the ordinary portion of a Screw threading and pointing machine, which serves the purpose of holding the ordinary clamps, P. I have not deemed it necessary to show the devices which feed the screw-blank into the machine, nor the cuttingtoolswhich cut the screw-thread on the Screwblank. These are of any ordinary construction, and form no part of my invention. f In wood-screw-pointing machines heretofore in use the end of the screw blank passes Athrough a hole in the bushing before it reaches IOO the pointing-knife, and I have found from experience that the screw-blank frequently does not enter the hole, and prevents the operation ofthe machine; and I also iind that when the blank is being pointed the end of the blank will frequently split or bend, so that the screwblank cannot readily be withdrawn from the cutting-tool. To obviate these objections I bevel the end of the bushing so that the blank will be directed to the recess O, where the cutting-tool is placed.

The operation of my machine is as follows: Thescrewblankis fedinto the grippingclamps I of the machine, and is held iirmly therein, so that the blank screw projects therefrom, as shown in Fig. '1, when the cam C strikes the pivoted lever D, and through the arm or pin F and spring G moves the sleeve forward, carrying the spindle J, which carries the socket L, with the bushing M and knife N, to the end ofthe screw-blank, which blank passes into the recess O, being directed to said recess by the concave end of the said bushing. The knife N commences pointing the blank as itis moved toward it by the force from the cam C and spring G. rIhis cam is so constructed as to move the bushing toward the screw-blank a certain iixed distance, this force being communicated from the spring G, which passes up behind the arm F. ln case the screw-blank is a little longer than ordinary, the spring G will yield, so that thc cutting-tools are thrown only Lo a certain distance upon the point of the blank, which causes every screw-blank to be pointed alike. \Vhen the screw-blank is pointed, one part of the cam ceases to act upon the pivoted lever D, and the pivoted lever D, receiving its reverse motion from the other part of the cam, restores the sleeve H to its former position, removing the bushing` M from the screw-blank, leaving it to be acted upon by the movement of the socket to screw-blanks of 5o slightlyvarying lengths.

My machine is simple, cheaply constructed, and very ein cient in its work.

Having thus fully described the construction and operation of my improvement, what I claim, and desire to secure by Letters Patent, is-

l. The bushing M, having a concave end and recess O, the recess being of the saine diameter and shape as the end ot' the screw and at the center ol' the concave, in combination with the socket L, cutting-knife N, and spindle J, substantially as specified and shown.

2. The bushing M, provided with the recess O and slot S, in combination with socket L, spindle J, and knife N, the knife being placedin a slot made in the bushing lli and spindle J, and held iirmlyin place by the socket L, and adjustable parallel with the spindle and bushing, as specified and shown.

8. The combination, in a screw threading and pointing machine, oi' the cam G, pivoted lever D, sleeve II, arm F, and spindle or bar J substantially as specified and shown.

4. The combination of the cam C, pivoted lever D, sleeve H, arm F, spindle J, and spring G, substantially as and for the purposes specified.

CHARLES F. WARD'ICLL.

\Vitnesses:

' XV. C.Y CoRLms,

A. M. BEST. 

